[HN Gopher] Time Travel: Probability and Impossibility ___________________________________________________________________ Time Travel: Probability and Impossibility Author : cacher Score : 28 points Date : 2021-11-08 21:36 UTC (1 hours ago) (HTM) web link (ndpr.nd.edu) (TXT) w3m dump (ndpr.nd.edu) | vanillax wrote: | This is like saying we will never fly a plane. Do you really | think people in the 1200's could fathom a phone or the internet | or access all information that ever has been on a device that | fits on your phone? Its incredibly naive to think that time | travel isn't possible purely based on "laws of physics". | hn_throwaway_99 wrote: | > Its incredibly naive to think that time travel isn't possible | purely based on "laws of physics". | | Huh? Would you argue that it's "incredibly naive" to think | perpetual motion machines aren't possible purely based on "laws | of physics"? Because I think it's incredibly naive to think | perpetual motion machines _would_ be possible, precisely | because they do violate the laws of physics. | tjs8rj wrote: | "The universe is not only queerer than we suppose, but queerer | than we can suppose" - J. B. S. Haldane | | I've seen so many documentaries and articles pessimistically | concluding we'll never go to another star much less another | galaxy based on the speed of light. Once again, too many smart | people conclude we've figured it all out as is the perennial | tradition. | jonathankoren wrote: | > Nikk Effingham's book is an exploration of all things time | travel (where time travel is to be read as backwards time travel, | that is, travel to an earlier time). | | I'd be interested to know if forward time travel is easier than | backwards time travel. Seems to avoid a lot of paradoxes. | nikhilgk wrote: | That's "relatively" easy to do. Get in a space ship that could | quickly get to a fraction of c, travel for a short amount of | time and then return back to the starting point. You would have | traveled to the future from the point of view of some one at | the starting point. | Octplane wrote: | It happens to me every night. Gets old pretty fast though... | spaetzleesser wrote: | Forward travel is easy. Go really fast or just hibernate. The | physics is easy. It's just an engineering problem. | modzu wrote: | forward time travel is perfectly consistent with the laws of | physics and in fact we've done it experimentally. backwards is | only possible observationally (ex. building a big telescope we | can look at the past) but we cannot effect it ___________________________________________________________________ (page generated 2021-11-08 23:00 UTC)